Spring structure.



M. SLELTH.

SPRING STRUCTURE.

APPLICAHON FILED HOV.1I, 1915.

wwma o Patented Jan.15,1918.

I I I W a A rrap/vs Y MONTGOMERY SLEETH, OF BELLEVUE, PENNSYLVANIA, ASSIGNOB. '10 FORT PITT BEDDING COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

SPRING STRUCTURE.

Specification of Letters Patent.

Patented Jan. 15, rate.

To all whom it may concern:

Be it known that I, MONTGOMERY SLEETH, a citizen of the United States, resident of Bellevue, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Spring Structures;'and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to spring structures, and has special reference to such structures for use as bed springs.

The object of my invention is to provide a cheap, simple and etlicient form of spring structure which when used as a bed spring will allow such spring to always maintain horizontal or level top surface when different weights of persons are using both sides of the same, and also when only one side of the same is used.

To these ends myinvention consists, generally stated. in the novel arrangement, construction and combination of parts, as hereinafter more specifically set forth and described and particularly pointed out in the claims.

To enable others skilled in the art to which my invention appertains to construct and use my improved spring structure, I will describe the same more fully, referring to the accompanying drawing, in which- Figure 1 is a bottom plan view of a bed spring employing my invention.

Fig. 2 is an end elevation of the partly in section.

Fig. 3 is a like view bed spring in use.

Like symbols of reference herein indicate like parts in each of the figures of the draw: ing.

As illustrated in the drawing, A represents my improved spring structure which is provided with the usual bed spring member 1 of the ordinarv approved construction, such as what is known as the National comprising tubular side bars 3, end bars supported in brackets 4 on the side bars 3, and a. spring fabric portion 2 supported by said end bars, the spring fabric portion being connected to the end bars by a plurality of strong helical springs.

Extending across the middle of the structure A. and beneath the member 1 is a compensating device B having the binding wires 5, which are in the form of loops and consame,

showing the finished nected to said member in any suitable manner. Beneath the binding wires 5 is the frame 6, which is composed of the side bars 7 and cross strips 8 extending across the same and connected thereto in any suitable manner. Between the frame 6 and the binding wires 5 are the helical springs 9, which are vertically disposed and provided with their convolutions larger at the upper ends than at the lower ends, such lower ends being connected to the frame 6 and such upper ends being connected to the binding wires 5 in any suitable manner. Extending along each side of the side bars 7 of the frame 6 are the compensating levers 10 and 11, which are provided at their outer ends with an open sleeve 12 for loosely fitting around the rods 3 of the spring member 1 to form a fulcrum for such levers, and such levers are also pivoted to such bars 7, as at 13, intermediate of their ends. The inner ends of the levers 10 are provided with a slot 14. in the same, and the inner ends of the lever 11 are provided with a bolt or pin 14. for engaging with said slot.

he usual mattress C is placed on the spring member 1 and in the normal position of the spring structure A, such as when it is not in use by a person or persons on the iattress, the levers 10 and 11 are upwardly disposed, so that they assume an inclined position, and with their upper end in close proximity to the spring member 1. When the weight or load, such as a person is placed on the mattress C, such as indicated at D, such mattress and spring fabric member 1 will move downwardly and the springs 9 on the line adjacent the weight will be de pressed and the springs 9 on the other side will be pulled the fabric which is resisted by the helical springs connecting the fabric to the end bars; the levers 10 and 11 being pivoted to the frame 6 and fulcrumcd on the side bars 3 will also be forced downwardly and thus aid in stretching the springs 9 on the opposite side of the device from which the weight is applied. Thus the fabric on the weighted side is not depressed as much as it would otherwise be, and the fabric on the unweighted side is depressed or pulled down to some extent, and the sag of the fabric is distributed so as to make the spring fabric substantially level transversely.

The best results may be obtained from down causing a tension on 9 hilt) my invention when the weight is applied above my improved device, which is preferably under the transverse central portion of the spring fabric.

It will be evident that other forms of spring members can be used in my improved spring structure, and that it can be applied to beds of different widths, while various other changes in the design, application and operation of the structure may be resorted to, without departing from the spirit of the mventlon orsacrificmg any of its placed upon the structure, which will thereby enable the persons using the bed to be positioned on the same in a more comfor able manner and will present the bed in a more pleasing appearance.

What I claim as my invention and desire to secure by Letters Patent is 1. In a bed spring structure comprising a frame, having side and end bars, and a spring bed bottom stretched between the end bars, a compensating device comprising a base, coil spring members, said coil spring members being secured to said base and to said spring bottom, levers tulcrumed on said frame and pivoted to said base and cooperating to tend to cause equal depression of bothsides of said bed bottom under unequal-weights.

2. In a bed spring structure, comprising side and end bars and a spring supported member stretched between said end bars, said spring supported member being connected to said end bars by a plurality of helical springs, a compensating device comprising a base, coil springs mounted on said base and secured to said spring supporting member, levers fulcrumed to said side bars and pivotedto said base and cooperating with said coil springs for causing equal depression of both sides of said bed bottom under unequal weights;

3. A bed spring structure comprising a frame having side and end bars and a spring bed bottom stretched between said end bars, a compensating device comprising a bas e member, a plurality of coil springs mounted on said base member and adapted to be secured to said spring bed bottom, levers pivoted on the sides of said base member adjacent each end, the levers on each side of said base member having their inward. ends connected by a loose joint connection, and the rear ends of said levers being fulcrumed on said side bars, substantially for the purpose described.

In combination with a bed spring, comprising side and end bars, and a spring mattress supporting member above said side bars and stretched between said end bars, of a compensating device comprising a base member, a plurality of coil springs secured to said base member and detachably secured to said spring mattress supporting member, and levers pivoted to the side of said baseadjacent each corner, said levers having their outer ends tulcrumed to said side bars of said bed spring, and their inner ends joined by a loose joint connection, said levers being adapted to cooperate with said coil spring members to cause equal depression of both sides of said bed spring under unequal weights.

In testimony whereof I, the said Monr- GOMERY SLEETH, have hereunto set my hand.

MONTGOMERY SLEETH.

Witnesses J. M. CooKn, Josnrnrnn MACGILVRAY.

Copies of this patent may be obtained for five cents each, by addressing the Commissionerof Patents,

Washington, D. C. 

